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simple-touch: fix off-by-one in position checks

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Fix the off by one error in checking whether we can draw the marker
without exceeding buffer dimensions.

Fixes a segfault.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
This commit is contained in:
Pekka Paalanen
2012-07-31 13:21:12 +03:00
committed by Kristian Høgsberg
parent 55b7cb24e0
commit 0768419393
1 changed files with 2 additions and 2 deletions
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clients/simple-touch.c
+2 -2
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@@ -118,8 +118,8 @@ touch_paint(struct touch *touch, int32_t x, int32_t y, int32_t id)
else else
c = 0xffffffff; c = 0xffffffff;
if (x < 2 || touch->width - 2 < x || if (x < 2 || x >= touch->width - 2 ||
y < 2 || touch->height - 2 < y) y < 2 || y >= touch->height - 2)
return; return;
p = (uint32_t *) touch->data + (x - 2) + (y - 2) * touch->width; p = (uint32_t *) touch->data + (x - 2) + (y - 2) * touch->width;